http://www.montsemorales.com/gramatica/tobe1.htm
http://www.bradleys-english-school.com/online/MultipleChoice/verbtobe.html
PRESENT:
http://www.isabelperez.com/happy/tenses/present_simple.htm
PASSAT:
http://www.ego4u.com/en/cram-up/grammar/simple-past/exercises?03
http://www.englishexercises.org/makeagame/viewgame.asp?id=2023
FUTUR:
Exercicis:
http://www.ego4u.com/en/cram-up/grammar/future-1-will/exercises
http://www.perfect-english-grammar.com/simple-future-exercise-1.html
THERE IS/THERE ARE:
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